SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fd17fbd063c6b57d1208c5ea958afe78aaad7380cd461bb096b10070bd43b8' 
  AND token = 'Gvg1Vx6C9QPj1zMYyn1KnZJNDmVkgqEQC2Q3/Ah3p3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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