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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09918612f27551ae730eb498fe106654c30dc0e0d7b2ed3bbcc7cd8e5bae2b4' 
  AND token = 'asAx3mzz8rF26seVlYSgYBPmzYDJc0dbBw034b45xqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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