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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab6dd254db2d7a2174f8a005776a96c33d8ba1e26fa68208cf90155d6d3b283' 
  AND token = 'dEGxIkbUy7jdcj1RFYZzTgtXWG3VG4xOR02PKzflpDw=' 
  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"
    }
  }
}