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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae91fe4a2bde90c5c14f9af87a2c3621b7f60ff3975eab24e234db70ff962e3' 
  AND token = 'a4UPxiYIlxCvu7E3RWGBFRaNmM9QQYSHdUMeImUct0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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