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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f37421e83a05619894d23959a11d208a278ad760ec45dc7a532ab48c4214a6' 
  AND token = 'ZOSZrET0SsfiMYWZ++Myj8vP35ooVEthohfs80Sar+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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