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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256fdb654a77578f71649f01d2a847f9c2295fd6e0b74f0be3c0059f47282d20' 
  AND token = 'ICED1Qbf9okcLmVD36sGXUC8Xvw0YRni5DF1En7OZ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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