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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf2bc7d4bcf516c27082f8b2821b5e2b91cb50d1339889422ebd783a9c28851' 
  AND token = '32i548qj3teJUiaubBZ+OZM8dmq30OwoCR50WI8ylLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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