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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c908bd6001f6611441bfe3fcc78f2def3c4ca18084f2097b77e4e4f609c229b8' 
  AND token = 'K2EjwMLhcMHqwJWy1St6tKmhDWiOK2dNlR5R+3DrYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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