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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9d558f3c4a19a01d1ea503f2528e0b990b27d92774c718a7d65f38e2792809' 
  AND token = 'n1vbbdN9CfJ/f+RgWX1R+KuNLB9bTwi2rWHR7Fs/Z4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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