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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e8e317adfc4d2b6816eb8683d054c948b45b0f31625d0298cf1be09cc4896b' 
  AND token = 'PN/fttYsmawrswBhS14nf8vTdsEfQFFnOVTSpIGr/us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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