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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c909f5b55bd6d4f9cd09b6a48efdf0d40c884241c401293579176de926c02f3b' 
  AND token = 'KcADdMh3ygeiXj4gwIYd6GU0Nt3Jr5F24iM8dDsVqo4=' 
  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"
    }
  }
}