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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8106c799b8899050e3ca2373f20507145894a3aaaf7f5b85afa90e9acbb403f' 
  AND token = '0+UPT4dedLqjeI6tBgFiF33x4CI0S6BHhRNF+I8CWqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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