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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15352a2096710473a809c86f00aa1649c6910c2b9d28daf2db69265aea76bb68' 
  AND token = 'ytwXacQE1OdFPWh3PIpNCLN02K6h1F7zylXs1hIiEOs=' 
  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"
    }
  }
}