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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e511ed8b14e98aa7856a909c0ffff53a71d0dd4ea767e10458d5e93e94b624' 
  AND token = 'GEgTea9ZL0/UR1rJiUpOaGbeJJTkfEnilnLE9edbQiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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