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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8175bbe1997ff64a4b0bf9ec3456eb675c9fd39076961c50d0848ffa4e19fe22' 
  AND token = 'uUtRF9AMcqValXHLz1H1K/JwH8+jIrMNdkci4E4r4ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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