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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4f2904d8e11fae71b6fb86dc18f74da254c28c6da1a94a443e7e3b74359c7d' 
  AND token = 'azwn8C4CKbCjDQ/95Fx2ggx2CJxsbQcz/lFbkJCUIpQ=' 
  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"
    }
  }
}