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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9a3ce65df76b19751d90159c0f2cfdec4e1bed7eed68b1121cd52e1bfff5f7' 
  AND token = 'UWPSOcPXp2Edg/rs+RhynzGXWLboD+OacqFnRKtT/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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