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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41decc886c32f1cbb584961f86c01a1fd56a248924515b7bf4d691b3174deb0' 
  AND token = 'IY62NKbzCUTL8AnJSZgkZxiv4PA9etO2uJkW5Wbf5GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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