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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726313d2ca2d4a1b9ae8eb0ac2d2c3fe570a821385aa43a62525ddf18cd791e3' 
  AND token = 'mpOG140EBeqlin+FhcBwNJ1OMRHn/4JlGGyIqORvL+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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