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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e41d7664669dde1ad8509cb1d46d0d6ddf84d4f8647eecddf48cdb0bb725c6' 
  AND token = 'ik43Qya+iUfOz3LE0n9sMsd+0PK/NlNc0Iq2GBIyHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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