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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849501eb57ce819a87d1a5c7a328a276ee133fb20384b413c603b570aa86b0b4' 
  AND token = 'yrkWWPOQGSC8InThd/lxLh20k1Tg368eCBm/jbkm3Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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