SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f6a6a1c5c92038b1456ca9f772e136fba12526db18ad28c87475996849ae77' 
  AND token = 'E8igGWh0HhBHCYMveQ7/pUn8m4tY9T0miCph33VX3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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