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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec34d6d379c0054bd3affc5b9e3b071bea6c0db4e894e3fd54ada58f63d1939' 
  AND token = 'Q0GX6phHP6XmpMtHpaSxw5H+B1iN1P6gHNfXdibtUUI=' 
  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"
    }
  }
}