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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe30d984b86e7a0d22b65cbe088c2fd81bdc3c67727383d257388f7aeff7593' 
  AND token = 'A5X/CsM1mV2TInULT4it9GiIj3sI/YecK1Q6rUxAEIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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