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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d9d494baa8f50b2c319f15e33d6690015d2c21f7daa4336606bd0d9d729d9e' 
  AND token = '8QJfnl3WVrA5NSlqxnOW+yYkT0W1mGRRsuoHM/Sx2zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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