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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470a2b75fdcc09dfe1260a984f4875052bdc2b2b672749c355c7d1ab47bed4c4' 
  AND token = 'uxa3ng+EE9pgyg3JQtnYmioWXQ8+Emx+daEqHyLCJzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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