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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d81a3dd12a6e6394dd62ec2d7e318625535ad4d4d7db1886105e55f7b554a15' 
  AND token = 'F7O9pBs8g8YuMlIt0/hoXAxz8Kefqpo6RfaWYGrbOj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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