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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dff06edd57b98fcf501953f9228cf42d512de38864f8d16f68f49e82a870f9' 
  AND token = 'ZDPxrnOIN9r3C0V9iHsIP59wk7bBZVuAuGZ515KLxuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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