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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeeab2020616eaeda5c6594f38ddbab7d51780c4dab208870e7944a4db269e5' 
  AND token = 'zF0VLgXs4MQ7j42mP/fZ0Ju16jIROCoW1zlDzMJG+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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