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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145079c9066bb02d0be2555a98822abedae592743eca7ae0456b8a690f496420' 
  AND token = 'V4/eHRE0Xg3bNfL51Npy1pEgpCFERy22+ZfWr7/rMmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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