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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe6ead7314e9f986cdbe46b895f2d42627458e19c6ebb9bd4d69911adcc21a5' 
  AND token = '6DLnbF5Fk5lYTNk8R+gdhsLKikTk5XJ7A+1iOXuGjqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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