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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24307fe1ddf69eba6266c04167b1ce1c3cbdff5938ea5afa058f5fa0a992552' 
  AND token = '4jxpX4qjm8Yfvnav/l4bj30kJRc/8EDOPG6WVrFNrsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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