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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edfe72f9c566aef681751d4f6232afac15851f9140ab86f6438a85ccc0711e1' 
  AND token = 'lFejbrV77LR2bZe+eoG+DcPSJsyto9LhF1u9NTVnFlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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