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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d23f322c722d22cdc0a1f00aaec1c49cd6a3c977aefadacb1bdad10101f75e3' 
  AND token = 'YhIrlRqdHXu3jntoDGRQaOv/+vr3rb+taYIEER/6T94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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