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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f95112dc9dc06c434ea9a852446efc4df0791bdf26f4d94593193c743e9e3f' 
  AND token = '0H41BmCA9Y6QgGodgsBQ6V6Z7BWtV4dpcZrppac473k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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