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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeb4834fef059e9e8ede252d0bde4aa4e8afb3da7c8dd2c500f853e699511ac' 
  AND token = '8dYfl0QDHJwFFkTYmkjwK9Uv9nK+8rWJzJurUxsSIkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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