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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ebaecbbe9139b1e9e98737173ad5dcd6b5be7b360233fc76afce1e4d394c5d' 
  AND token = 'gFxMiDa60kOdDb7DkdDJ1cG53tWUsycWbe6e3P0nYKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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