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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a5e88088eb35120fa5ee9d973a3669f08d5ac1717d7629734a8fd51352a384' 
  AND token = 'E95Iszjw+0mIf6eAGI79xip6Y6Ge7R4UcaCmD+0TS9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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