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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ed96d44df0db0ab734f6797de52b5a15e364977cdccd7d748928df12c519cf' 
  AND token = '/3C58ZFGQgq40WI826Kjd0l0a8E12WZImcTvOtu010U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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