SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e134bc62f0ac0c524e9844f2f6701689f699851fc3c2d8de4e130d1bdb088a2' 
  AND token = 'Fw1SBlWPnEgMYcJvzWV/ylOpmlIq7etxx4tMZIj9yoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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