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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068577dd7b21abb7ae6017179dbf80f13f8c2d7cc25c23c1da544034e82896b7' 
  AND token = '3o5vxcUJK8h7Sjk7DPlT3v1oLggYuduahZEbSYTsqX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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