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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e034ed52d841a45e21145892cd6f1c71fee5f686d526a9f1badd9c61afecd9e6' 
  AND token = '/DswiaNnDWt9WDMSCI6ECeCvE0Y1TIhyBL41Sow01uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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