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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b6d375b06805c23560b9289cf942ba8d53426eb1c58d1f9a5c12a827f0f019' 
  AND token = '2Slurqr7RsHll90TOj/Ouis3W1x/o4T/VWxlIoFT/h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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