SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad63a5e68f165a7671c8dffcedafbe8ef9bc0497f9b2977cc0135618ea324d02' 
  AND token = 'NVqwEfgOo1lo50C/b6VkyV2RAngYjPJjZv1Ch9dUkqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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