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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95087fdda564954b43c106650ff636a28a639d704b0756c151e466d8f9e4e7d8' 
  AND token = 'SK09Z3h1xCB5xomE2Lv5T0goTPMziunkGtmIzj+bI9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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