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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdb940c448fd14a39fede8ac3810c5fb2ee79e8318f7bd816b602c5ef9250ba' 
  AND token = '3Sgh9DyoICCzPnSbL71Lk26JGW3UwH2V26qbjA2q65Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}