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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eac8ff32c29d1d15425ca706ee6f8386a78060022aaf79665d7ae73e9021b6' 
  AND token = 'nHqAvNwLGR8Ipdkd0BUDobtzQo61spvaRebcGyVTNxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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