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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e404dac9b3aa471a2350dbfa3cbccde3d0fdc0176abd2eb9235a98187ce3021' 
  AND token = 'PjECAJGzojXwNvaAlRiYI9hqQyQ6iCKPKCU4yebQ0fg=' 
  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"
    }
  }
}