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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3045c7d0a864ce2febdd2b211aee0fc4a2cec5793a9df42310331eb9bdbc8b1c' 
  AND token = 'zRC14Ot4G+Wrk0AonFEa7HyN+NJOI/g7BUAITji8oww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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