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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d06177ead1e501c4e6ac95286e5014059c636483ae25abfea485955b8b7f64' 
  AND token = 'OpUodyq+/wbb++1S5xPpCsjLpbvH/+Mgn5Il0Mg87Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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