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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d913d0a276b6510482768f1770773d32e21fbaab09b69d3c7550cc7d07d028' 
  AND token = 'GbapKgmnB8mqLTbwlFWqe+KktnovqD87e8o+aNw84Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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