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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f48a8edd245b2d5a95419f4256ab311d19386a35eb2df11a2e6ff7d15f0ea80' 
  AND token = 'x2WKuCE3pA9i2s7eGpZ/rQ9eutOKs8xBX70Zgm8uZZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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