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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deea7341565bd7255897ca1e1293f566feff19b29f75e8da9f08e58f9dc6607' 
  AND token = 'OA2ZK3VzpE9KTUzia4iP5Ouet0w09z617uE2WIWEiM0=' 
  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"
    }
  }
}