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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ae61c021f9d8db1443b24c313c0e4750993760daf5d6e34cdb25155a946470' 
  AND token = '3pzkBOtZs8xAVULy9kOXdDJaBwVhnaOzIc7AeZo1LR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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