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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de514caacef4e0208e549ac894ee01ba6867a4e59d9ccf17f7a5bea16e39854b' 
  AND token = 'Cbs7/ot9n9zPJeTSj/ojWCHmiWmB1Gd128x/c5biW00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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