SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df89e9405a1a75403154d59f9b1b3244b51ce64fae18d413371a1e80ebf274da' 
  AND token = '93gnTnH0KGzAzuv7G+W/uUnGX6M/6Qh2M1ikwvEoUqY=' 
  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"
    }
  }
}