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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9258f6df812f7ed268bd26ebf6123d96765d0e646993cc01ec1b0bd06b62805' 
  AND token = 'fQL1AJE2C9MOu5KHz1Td74E8ojiz9rQClxDA3DX1p6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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